How can I prevent VS Code from replacing a newly opened, unmodified (preview) tab with a subsequently opened one?

I am using Visual Studio Code 1.3.1 with the newly introduced tabs.

When I click on files, the first file will open in a tab. If I do not make any changes to this file, the second clicked file will open in the same tab.

How can I avoid this and make Visual Studio Code always open a new tab?